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3 years ago

Which does a reference point provide? Select 2 correct choices.

Physics

2 answers:

erastova [34]3 years ago

6 0

Answer:

1 and 4

Explanation:

grigory [225]3 years ago

4 0

Answer:

The correct answers are 1 and 5

Explanation:

A reference point provides a position from which to measure future distance. This is possible because to measure a distance we must have a reference point at which to take the measurement. In general, any point in space takes as reference the origin of coordinates.

It also serves to detect the movement of an object, since if the distance between the object and the reference point varies, it can be determined that the object is in motion.

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Hernando builds a simple DC series circuit with a standard D-cell battery and uses an ammeter to determine that the total curren

HACTEHA [7]

Answer: I = 9.0 A

Explanation: Ohm's Law is defined as the relationship between voltage and current: in a circuit, the voltage accross a conductor is directly proportional to the current.

The constant of proportionality is Resistance, whose unit is ohm (Ω).

so, Ohm's Law is

V = R.I

It is asked for the current, so, rearraging:

$I=\frac{V}{R}$

When added two more batteries, the voltage of the circuit triples:

$V_{final}=3V_{initial}$

Since they are directly proportional, if voltage triples, so does current:

$I_{final}=3I_{initial}$

$I_{final}=3(3.0)$

$I_{final}=$ 9.0

The new current, when driven by 3 batteries is 9.0 A.

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3 years ago

What is terminal velocity and when is it reached?

Ne4ueva [31]

Terminal velocity is the velocity at which a falling body experience when its weight is equal to the force resistance of force opposing the fall.

At terminal velocity the acceleration of the body is zero, which implies that the value of the this velocity is a uniform.

8 0

3 years ago

EDGE 2021 WILL GIVE BRAINLIEST

defon

Answer:

B A new compound is formed

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2 years ago

What is the kinetic energy of an object with a mass of 50kg and is and it is traveling at a rate of 60m/s.

liq [111]

Answer:

90,000 J

Explanation:

Kinetic energy can be found using the following formula.

$KE=\frac{1}{2}mv^2$

where m is the mass in kilograms and v is the velocity in m/s.

We know the object has a mass of 50 kilograms. We also know it is a traveling at a rate of 60 m/s. Velocity is the speed of something, so the velocity of the object is 60 m/s.

m=50

v=60

Substitute these values into the formula.

$KE=\frac{1}{2}*50*60^2$

First, evaluate the exponent: 60^2. 60^2 is the same as multiplying 60, 2 times.

60^2=60*60=3,600

$KE=\frac{1}{2}*50*3,600$

Multiply 50 and 3,600

$KE=\frac{1}{2}*180,000$

Multiply 1/2 and 3,600, or divide 3,600 by 2.

$KE=90,000$

Add appropriate units. Kinetic energy uses Joules, or J.

$KE=90,000 Joules$

The kinetic energy of the object is 90,000 Joules

6 0

3 years ago

I). Mechanical energy is the sum of potential energy and kinetic energy in an object that is used to do work.

Dmitry_Shevchenko [17]

Answer:

false statement : b ) For the motion of a cart on an incline plane having a coefficient of kinetic friction of 0.5, the magnitude of the change in kinetic energy equals the magnitude of the change in gravitational potential energy

Explanation:

mechanical energy = potential energy + kinetic energy = constant

differentiating both side

Δ potential energy + Δ kinetic energy = 0

Δ potential energy = - Δ kinetic energy

first statement is true.

Friction is a non conservative force so inter-conversion of potential and kinetic energy is not possible in that case. In case of second option, the correct relation is as follows

change in gravitational potential energy = change in kinetic energy + work done against friction .

So given 2 nd option is incorrect.

In case of no change in gravitational energy , work done is equal to

change in kinetic energy.

4 0

3 years ago